We look at the division of 84639133 by 686 
The aim is to understand the frequency of 686 in 84639133.

Advancing to step 1:
If we divide 8 by 686, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 686

Advancing to step 2:
686 can be fit into 84 0 times, resulting in a remainder of 84.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 84 to get 84.
Fetch the next digit (6) from the dividend, attach it to 84 and continue: 846 / 686

Step 3:
If we divide 846 by 686, we get 1 and a remainder of 160.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 686 from 846 and we're left with 160.
Bring next digit (3) of the dividend behind the 160 and repeat the process: 1603 / 686

Going ahead to step 4:
1603 divided by 686 is 2 with a remainder of 231.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtracting 1372 from 1603 leaves us with 231.
Append the next digit (9) from the dividend to 231 and continue with: 2319 / 686

Let's proceed to step 5:
When dividing 2319 by 686, we get 3 with a remainder of 261.
Put 3 as the next digit of the answer. 
Result so far: 123.0
The remainder is 261 after subtracting 2058 from 2319.
Include the next digit (1) from the dividend after 261, then repeat: 2611 / 686

Let's proceed to step 6:
2611 divided by 686 is 3 with a remainder of 553.
Use 3 as the next digit of our solution. 
Result so far: 1233.0
The remainder is 553 after subtracting 2058 from 2611.
Fetch the next digit (3) from the dividend, attach it to 553 and continue: 5533 / 686

Step 7:
686 goes into 5533 8 times with a remainder of 45.
Use 8 as the next digit of our solution. 
Result so far: 12338.0
Subtract 5488 from 5533 to get 45.
Bring next digit (3) of the dividend behind the 45 and repeat the process: 453 / 686

Advancing to step 8:
If we divide 453 by 686, we get 0 and a remainder of 453.
Put 0 as the next digit of the answer. 
Result so far: 123380.0
If we take 0 away from 453, we end up with 453.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4530, and continue the process.

On to step 9:
When dividing 4530 by 686, we get 6 with a remainder of 414.
Put 6 as the next digit of the answer. 
Result so far: 123380.6
If we subtract 4116 from 4530, we get 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

Going ahead to step 10:
4140 divided by 686 is 6 with a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 123380.66
Deduct 4116 from 4140 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

After the division, we end up with 123380.66 and a remainder of 0.024.